Method of controlling air-fuel ratio of internal combustion engi

Details Method of controlling air-fuel ratio of internal combustion engi Method of controlling air-fuel ratio of internal combustion engi

1980-06-24

1982-10-12

Gruber, Felix D.

Boots, shoes, and leggings

123480, 123489, 36443112, F02B 304, F02D 3500

Patent

active

043542387

ABSTRACT:
A method of controlling the air-fuel ratio so as to be effectively maintained at a desired air-fuel ratio of .lambda.=1 is composed of a combination of an electronic map control for effecting the air-fuel ratio control on the basis of map data read out from a data map stored in ROM as air-fuel ratio control data in correspondence to various operation parameters of an engine and an O.sub.2 -feedback control for controlling the air-fuel ratio on the basis of oxygen quantity detected from the exhaust gas. Upon the occurrence of changes in the control quantity for a predetermined number of times in the course of the O.sub.2 -control, the latter is changed over to the map control. At that time point, a control quantity for the map control is corrected on the basis of a mean control quantity during the O.sub.2 -feedback control. Unless a significant variation takes place in the engine operating conditions, the map control is continued for a predetermined time and then changed over to the O.sub.2 -control. Upon the occurrence of a significant variation in the engine operating conditions, the map feedback control is immediately changed over to the O.sub.2 -control.

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patent: 4224910 (1980-09-01), O'Brien
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patent: 4270503 (1981-06-01), Pomerantz
patent: 4290107 (1981-09-01), Suda et al.
patent: 4294212 (1981-10-01), Aoki

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